Home / 21,891.24-30,209.16-12,818.58

Finding the Fourth Proportional to 21,891.24, 30,209.16 and 12,818.58

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Solution

The fourth proportional to 21,891.24, 30,209.16 and 12,818.58 is: 17,689.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,891.24 : 30,209.16 = 12,818.58 : x
  2. Step 2: Convert to fraction form
    21,891.24/30,209.16 = 12,818.58/x
  3. Step 3: Cross multiply
    21,891.24x = 30,209.16 × 12,818.58
  4. Step 4: Simplify right side
    21,891.24x = 387,238,534.19
  5. Step 5: Solve for x
    x = 387,238,534.19/21,891.24
  6. Step 6: Final answer
    x = 17,689.20

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.